Nexus One recent  Nexus S and are already pushing Android 2.3.4 firmware, N1's 2.3.4  already OTA, OTA Here is Android123 upgrade files extracted, you can use  SD card brush, the upgraded version for the GRJ22, kernel Linux  2.6.35.7.   The main improvement is not large, in addition to GTalk's video  capabilities, the system time is more time, here is the Nexus One of the  2.3.4 OTA upgrade file, the official download link for the http://android.clients.google.com/packages/ ota/passion/71d2f9ecd610.signed-passion-GRJ22-from-GRI40.71d2f9ec.zip